Anyone else had issues with their Epever controller dropping WiFi connection in winter?

I've had exactly this problem with my Epever setup in the shepherds hut. The MT50 remote display would lose connection every few weeks during winter, though the controller itself kept running fine. Bit frustrating when you can't monitor your battery state from indoors.

What I eventually realised was temperature-related. The WiFi module itself gets cold in the unheated external enclosure, and it seems to struggle reconnecting after cold nights. The actual MPPT controller was fine, just the comms dropping out.

A few things that helped:

Better insulation — I moved the Epever unit to a slightly warmer spot in the hut and added some foam insulation round the control box. Connection's been more stable since.

Firmware update — Worth checking if you're on the latest. Epever released updates addressing connectivity issues.

Power cycle routine — I added a scheduled restart into my Victron setup. Not ideal long-term, but it helped identify whether it was a hard lockup or just connection state.

WiFi signal strength — Winter often means worse signal paths (water in the air, etc.). If you're borderline on signal strength anyway, cold temps might just tip you over the edge.

The real fix would be moving to wired monitoring if possible, but I get that's not always practical depending on your setup.

Has anyone else found the Epever units more stable over Bluetooth? Considering whether it's worth switching protocols rather than fighting the WiFi gremlins. Also curious if this affects other brands similarly — I know Renogy users who've mentioned similar winter issues.

Ah, the classic winter WiFi gremlins. Had this exact nonsense with an older Epever setup in my cabin—drives you up the wall when everything else is working perfectly.

Few things worth checking: are you getting condensation buildup around the MT50 or controller itself? Shepherds huts can be murder for moisture in winter. Also, if your antenna cable runs anywhere near the solar wiring, you might be getting interference from the DC currents, especially when the sun's weak and the controller's working harder.

Try repositioning the antenna away from any metal frames or moving the MT50 slightly—sometimes a few centimetres makes all the difference. If you're still having bother, consider swapping to a hardwired setup or upgrading to something more robust like a Victron if the budget stretches.

What's your winter temperature range like in the hut?

Yeah, frustrating isn't it. I've not had WiFi drop on mine but I switched to the MT50 display cable connection instead — bit annoying running the cable but rock solid reliable. The WiFi modules can get finicky in cold weather, especially if your setup's anywhere damp.

Worth checking: is your router near the controller or tucked away? Distance + metal in sheds/offices absolutely kills the signal. Also make sure the antenna on the Epever's WiFi dongle isn't corroded — moisture gets in there something chronic over winter.

Have you tried a WiFi extender or moving the controller slightly? I know it's not ideal if you've already got it positioned for solar angle, but might be worth testing before chasing other solutions.

Yeah, seen this plenty with Epever kit. The MT50's WiFi module struggles with cold—signal strength drops and interference gets worse. Worth checking if your setup's getting proper ventilation around the controller itself. Heat management matters more than people think.

Have you tried repositioning the MT50 or adding a bit of shielding? Sometimes just moving it away from other electronics helps. Also, what's your actual signal strength like in the shepherds hut? If you're at the edge of range anyway, winter degradation pushes it over the edge.

Honestly, if it's just dropping every few weeks and the controller's running fine, you might just swap to cable connection like @WattHamish mentioned. More reliable than relying on WiFi in remote setups. I ditched the WiFi side of things years ago on my boat system—cable's never let me down.

Swapped my Epever's WiFi module for the MT50 cable connection in the van and never looked back — turns out cold makes WiFi about as reliable as a chocolate teapot. Though if you're determined to keep wireless, try repositioning the controller away from metal (motorhome chassis was my culprit) and chuck a bit of insulation around the MT50 itself. Mine's now wrapped in some spare rockwool offcuts and it's behaved ever since. Winter in the garden office was a nightmare until I realised the WiFi was basically screaming into a metal filing cabinet. @WattHamish's got the right idea with the cable — boring but bulletproof.

Had this exact issue with mine. The WiFi module in the MT50 is honestly a bit dodgy in general, but cold definitely makes it worse—temperature affects the antenna performance something chronic.

Rather than fight it, I went hardwired with the MT50 display on a cable run. Yeah, it's not as convenient, but it's bulletproof reliable and you get the same data readout. Took about an hour to route the cable through my setup.

If you're set on wireless, try repositioning the controller itself—keep it slightly warmer if possible, even an extra few degrees can help. Also check your WiFi signal strength in the app before winter hits. If it's already marginal in autumn, it'll fail when temperatures drop.

Honestly though? For a shepherd's hut where you're not moving it around, the wired MT50 is the sensible choice. Saves you faffing about come January.

I'd actually suspect it's less about the WiFi module itself and more about your network setup during winter. Cold does degrade signal, sure, but I've found the real culprit is usually interference from heating systems kicking in—storage heaters, immersion heaters, that sort of thing create significant noise on the 2.4GHz band.

Worth checking: what's your router placement relative to the garden office? If it's more than 10-15 metres away through solid walls, winter atmospheric conditions will absolutely murder your signal. I moved mine closer and it sorted it entirely.

That said, @BitsAndBobs has the right idea—the MT50 cable connection is genuinely more reliable. If you're in a permanent setup like a shepherd's hut, honestly just run the CAT5 cable. You're not sacrificing anything meaningful and you eliminate the entire WiFi variable.

What's your distance from router?